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- Seagate
- HAWK 2 ST12400W/WD/WC
- Product Manual
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Product Manual - Hawk 2 Family (Wide bus) SCSI-2 (Volume 1), Rev. A 3
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3.0
General description
The drives are a member of a family of low cost, high performance, highly reliable, random access storage devices designed to meet the needs of the OEM marketplace.
The drive records and recovers data on 3.7 inch (95 mm) fixed discs.
The drive supports the Small Computer System Interface (SCSI-1, SCSI-2 and SCSI-3) as described in the
ANSI SCSI Interface Specifications to the extent described in this product specification (Volume 1). This manual defines the product performance characteristics of the ST12400 wide family of drives, together with the SCSI-2/SCSI-3 Interface Product Manual P/N 77738479 (Vol. 2, Version 2) which describes the general interface characteristics of this and other families of Seagate 3.5-inch drives.
The drive interface supports multiple initiators, disconnect/reconnect, self configuring host software and automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets
(logical block addressing is used).
The Head/Disc Assembly (HDA) is environmentally sealed at the factory. Air recirculates within the HDA through a nonreplaceable filter to maintain a contamination free head/disc environment.
Refer to Figure 3.0-1 for an exploded view of the drive. NEVER disassemble the Head/Disc Assembly (HDA).
This exploded view is for information only. Do not attempt to service items in the sealed environmental enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no parts replaceable by the user. The drive warranty is voided if the HDA is opened.
The ST12400 wide family drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing zone when the power is removed.
The ST12400 wide family drives incorporate an automatic shipping lock which prevents potential damage to the heads and discs that result from movement during shipping and handling. The shipping lock disengages when power is applied to the drive and the head load process begins.
The ST12400 wide family drives decode Track 0 location from the dedicated servo surface to eliminate mechanical transducer adjustments and related reliability concerns.
The ST12400 wide family drives use a high performance actuator assembly that consists of a low inertia, balanced, patented, straight arm design that provides excellent performance with minimum power dissipation.
4 Product Manual - Hawk 2 Family (Wide bus) SCSI-2 (Volume 1), Rev. A
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ST12400W/WD PCB
Figure 3.0-1. Hawk 2 family (Wide bus) drive
ST12400WC PCB
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Table of contents
- 9 Scope
- 10 Applicable standards and reference documentation
- 10 Standards
- 10 Applicable reference documents
- 11 General description
- 13 Standards features
- 13 Performance
- 13 Reliability
- 14 Unformatted and formatted capacities
- 14 Options (factory installed)
- 14 Optional accessories (user installed)
- 15 Installation
- 16 Performance characteristics
- 16 Internal drive characteristics (transparent to user)
- 16 SCSI drive Seek, Read and Write performance characteristics (Visible to User)
- 16 Seek time
- 17 Format drive command execution time
- 17 Read data command execution time
- 17 Write data command execution time
- 18 Generalized performance characteristics
- 19 Start/stop time
- 20 Prefetch/multi segmented cache control
- 20 Cache operation
- 21 Prefetch operation
- 22 Caching write data
- 22 Synchronized spindle operation
- 26 Reliability specifications
- 26 Error rates
- 26 Read errors
- 26 Environmental interference
- 27 Write errors
- 27 Seek errors
- 27 Reliability and service
- 27 Mean time between failure
- 27 Preventive maintenance
- 27 Service life
- 28 Service philosophy
- 28 Installation
- 28 Service tools
- 28 Product Warranty
- 29 Physical/electrical specifications
- 29 AC power requirements
- 29 DC power requirements
- 30 Conducted noise immunity
- 30 Power sequencing
- 30 12 V - current profile
- 31 Heat/power dissipation
- 31 Environmental limits
- 32 Temperature
- 34 Relative humidity
- 34 Effective altitude (sea level ref)
- 34 Shock and vibration
- 36 Air cleanliness
- 36 Electromagnetic compatibility
- 36 Electromagnetic susceptibility
- 37 Mechanical specifications
- 37 Drive orientation
- 38 Cooling
- 38 Drive mounting
- 39 Media characteristics
- 39 Media description
- 40 Defect and error management
- 40 Drive internal defects/errors
- 40 SCSI systems error considerations
- 41 Option/configuration headers
- 41 Drive ID/option select header
- 47 Synchronized spindles interface
- 47 10.2.1 Electrical description
- 48 Grounding
- 49 Interface requirement
- 49 General description
- 50 SCSI interface messages supported
- 51 SCSI interface commands supported
- 53 Inquiry data
- 54 Mode sense data
- 57 SCSI bus conditions and miscellaneous features supported
- 58 Synchronous data transfer
- 58 Synchronous data transfer periods supported
- 58 REQ/ACK offset
- 59 Physical interface
- 60 DC cable and connector
- 60 Physical characteristics
- 61 Connector requirements
- 68 Electrical description
- 73 Disc drive timing
- 75 Options
- 75 Front panel
- 75 Single unit shipping pack
- 76 Accessories
- 76 Front panel kit
- 76 Installation manual
- 77 Seagate Technical Support services
- 78 Seagate Peripheral Family